3моль 4моль
3Fe+4H2O(t) =Fe3O4+4H2
3 4
n(Fe)=168/56=3моль; n(H2)=3*4/3=4моль; V(H2)=4*22,4=89,6л.
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По моему так: Al4C3+12NaCl =4AlCl3+3Na4C
<span>CaC2+2NaCl=CaCl2+2NaC</span>
Oтвет:CH2=CH2(Б) и CH4(B)
N=N/Na
n=24.06*10^23/6.02*10^23=если округлить 4 моль